Hydraulic brake mechanism



Sept. 3, 1935, a. DICK Er AL HDRAULIC BRAKE MECHANISM Original Filed July 1l. 1928 Reissued Sept. 3, 1935 UNITED STATES PATENT OFFICE HYDRAULIC BRAKE MECHANISM Original No. 1,896,223, dated February 7. 1933, Serial No. 291,723, July 11, 1928. Application for reissue November 24,

(Cl. 18S-152) 3 Claims.

Our invention relates to hydraulic braking apparatus for vehicles and particularly to means for connecting the flexible hose to the piston cylinder combinaticn which actuates the brake shoes, it being the object to form a connector which performs the functions hereinafter described.

The figure of the accompanying drawing is a cross sectional view of our connector and of sufficient of the brake apparatus to illustrate its embodiment and relation to other parts.

I represents the mounting plate for the shoes 2 and 3, 4 and 5 represent respectively a drawn metal cylinder and drawn metal piston to cooperate therewith by means of which the shoes are actuated. The flexible hose 6 which transmits the braking liquid from the source of pressure, is connected with the cylinder 4 by means of the hose iltting l. This fitting is provided with a threaded portion engaging with a threaded opening in the end of the cylinder and with a part 8 which extends Within the cylinder to form a stop for limiting the inward travel of the piston. As is known, it is necessary in hydraulic braking apparatus to provide means for expelling all air from the liquid containing parts and it has heretofore been the practice to make an opening in the wall of the cylinder for this purpose, this opening being usually referred to as the b1eeder" opening and being closed by a screw. However, it is not convenient to form and provide means for closing such an opening in the thin wall of a drawn metal cylinder and we have conceived the idea of incorporating the bleeder passage in the hose fitting 1, this passage being marked 9 in the drawing. Preferably also we apply to the iltting a laterally extending nipple Il) forming an extension of this passage and provided with a screw plug Ii to close the opening. This nipple extends through the mounting plate I and thus becomes accessible for the attachment oi' the bleeder hose which is used while pumping liquid through the system to eliminate all air therefrom. The hose 6 is permanently attached to the tting 1 by any suitable known means, such as by the expanded metal part I2 forcing the material ot the hose into the annular depressions in the end of the interior wall of the tting.

1934, Serial No.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

l. A braking device comprising brake shoes, hydraulic means for actuating said shoes comprising a cylinder and a piston movable therein, a liquid supply conduit, and a tting permanently attached to said conduit for connecting it with the cylinder, said fitting being provided with a part projecting into the cylinder to form a piston stop.

2. A braking device comprisin'g brake shoes, hydraulic means for actuating said shoes comprising a cylinder and a piston movable therein, a liquid supply conduit, and a tting on said conduit and provided with a passage connecting the latter with thc cylinder, said fitting being provided with a part projecting into the cylinder to form a piston stop and with a second passage communicating with the cylinder and extending to the exterior of the tting.

3. In hydraulic brake actuating mechanism, the combination with a rigid walled liquid receiving cylinder provided with a threaded opening therethrough, of a flexible hose for supplying liquid to said cylinder, a hose terminal comprising a portion embracing and permanently secured to the end of the hose and a threaded extension separably engaging said cylinder opening, the longitudinal axis oi' the threaded surface extending in the same direction as the longitudinal axis of the portion of the terminal embracing the end of the hose, said extension being provided with a passage therethrough placing the hose in communication with the cylinder and being also provided with a second passage therethrough communicating with the cylinder and extending to the exterior of the hose terminal at a point to the rear of said threaded extension, said second passage not communicating with the first named passage at any point within the hose terminal, and means for opening and closing said second named passage.

BURNS DICK. STEVE SCHNELL. 

